Rubber-bag body.



No. 768,945. PATENTED AUG. 30, 1904. I. P. KEPLER.

RUBBER BAG BODY.

APPLICATION FILED AUG. 31. 1903.

no MODEL.

ATTORN EY Patented August 30, 1904.

UNITED STATES PATENT OFFICE.

IRWIN FLOYD KEPLER, OF AKRON, OHIO, ASSIGNOR TO THE B. F. GOOD- RICH-COMPANY, OF OHIO, AKRON, OHIO, A CORPORATION OF OHIO.

. RUBBER-BAG BODY.

SPECIFICATION forming part of Letters Patent No. 768,945, dated August 30, 1904.

Application filed August 31, 1903. Serial No. 171,382. (No model.)

To all lU7b077L it may concern:

Be it known that I, IRWIN FLOYD KEPLER, a citizen of the United States of America, and a resident of the city of Akron, county of Summit, and State of Ohio, have invented certain new and useful Improvements in Rubber Bag Bodies, of which the following is a specification.

This invention relates to bag-bodies made mainly from sheet-rubber stock and of that class used in makinghot-water bags and analogous hollow rubber articles.

The invention has for its object to provide a rubber-bag body or like hollow article which 5 is stronger, more durable, and less expensive 3 and in which Figure 1 is a perspective View, partly broken away and in section,,of a rubber-bag body made in accordance with my invention. Fig. 2 is a central longitudinal section of the body,

taken on the line a; in Fig. 1. Fig. 3 is a face view of the bed-section of the cuttingdie used in shaping the rubber-bag-body walls from sheet-rubber stock. Fig. 1 is a transverse section through both portions of said 4 cutting-die. Fig. 5 is a face view of the bedsection of the finishing-die, and Fig. 6 is a cross-section through both portions of said die. Fig. 7 is a detail cross-section illustrating how the rubber-compound reinforcingstrip is laid between marginal portions of the uncured bag-body walls. Fig. 8 shows how the parts of Fig. 7 are integrally or homogene- 'ously united by pressure of the finishing-die, and Fig. 9 is a partly-broken side view of a complete vulcanized hot-water baghaving' an 5 improved body provided with the interior marginal homogeneous reinforcing-strip.

Referring first to Figs. 1 and 2 of the drawings, itwill appear thatthis improved bag-body is made with two opposing side walls 1 2, which are cut, preferably, by dies from uncured sheet-rubber stock, and an interior marginal reinforcing-strip 3, which may have any desired cross-sectional form and is first laid as an independent rubber-compound strip between the two body side walls 1 2, except where the bag mouth or opening is-to be formed, and said marginal strip then is integrally united to or homogeneously incorporated with the side walls by direct pressure, which pref- 5 erably is die-pressure, as hereinafter more fully explained.

3 of the drawings is a plan view of the bed-section 4c of the cutting-die, both sections 4 5 of which appear in cross-section in Fig. 4 7 of the drawings. The face of the bed-die d is indented or serrated to produce surface ornamentation 6 of the bag-body wall by final movement of the plunger-die 5 after said wall has been marginally cut out by the shearing edges 7 of the die.

Fig. 5 of the drawings is a plan view of the bed-section 8 of the finishing-die, both portions 8 9 of which are shown in cross-section in Fig. 6 of the drawings, which more clearly illustrates the raised shearing edges 10 of this die, which marginally compress and trim the bag-body.

After the two opposite side walls 1 2 of the bag-body are cut out and also face-ornament- 5,

ed by the cutting-die at 5 the rubber-compound reinforcing-strip 3 is laid marginally between the two sheet-rubber-bag walls 1 2, substantially as in Fig. 7 of the drawings, such disposal of parts beingmade, preferably, 9 while placing them upon the bed-section 8 of the finishing-die, whereupon the plunger-section 9 of said die is brought down and intimately-or integrally joins by pressure the side walls 1 2 and marginal reinforcing-strip 3, and at the same time the finishing-die trims off surplus rubber material all around the margin of the bag-body. The finishing-die thus leaves the parts 1 2 3 homogeneously joined together practically as one integral jointless bag-body structure, as will be understood from the sectional marginal view of the body shown in Fig. 8 of the drawings, wherein the integral or homogeneous portion (marked 3) represents the former separately-applied reinforcing-strip 3 of Fig. 7 of the drawings. After the bag-body thus is formed the screwneck, funnel, and suspension-straps or other necessary adjuncts are supplied to it, and the whole then is vulcanized to form the complete hot-water bag, (shown in Fig. 9 of the drawings,) or it may be any other hollow rubber article or structure adapted to contain air or fluid.

It is obvious that a rubber-bag body or analogous article made as above described has a heavily beaded or reinforced edge which is jointless and homogeneous, and in 1 consequence much stronger and more durable than a bag-body, made by marginally overlapping opposite sheet-rubber side walls and then applying a reinforcing-strip across the lapped joint at the outside and cementing the joints, as formerly has been done. Furthermore, in

practicing my invention there is no waste because of imperfect unction of parts of the bag-body as an intimate, integral, and

'Yoagseo Finally, in View of the above-named eliminations of waste due to imperfect lap-joints of bag-bodies as formerly made, and also in view of the greater ease and speed of manipulating parts of bag-bodies made in accordance with my invention, 1 am able to produce a much stronger and more durable bag-body and finished bag or analogous hollow rubber article at a much reduced cost.

1 claim as my invention 1. A vulcanized rubber seamless bag or like article having its marginal sections denser than the other portions of its body.

2. A vulcanized rubber seamless bag or like article having its edges thicker and denser than the other portions of its body.

3. A vulcanized rubber seamless bag or like article having its marginal sections integral with and denser than the other portions of its body.

IRWVIN FLOYD KEPLER. Witnesses:

HARRY A. BAUMAN, TILLIAM A. MEANS. 

